<template>
    <el-breadcrumb class="app-breadcrumb" separator="/">
        <transition-group name="breadcrumb" >
            <el-breadcrumb-item v-for="(item,index) in levelList" :key="item.path" :class="{'breadcrumbtitle': index==levelList.length-1}">
                <!-- <span v-if="item.redirect==='noRedirect'||index==levelList.length-1" class="no-redirect">{{ item.meta.title }}</span>
                <a v-else @click.prevent="handleLink(item)">{{ item.meta.title }}</a> -->

                <!-- 第二版 -->
                <span v-if="levelList.length > 2">
                    <span v-if="item.redirect==='noRedirect'||index==levelList.length-1" class="no-redirect">{{ uniqueThere }}</span>
                    <a v-else-if="item.redirect==='noRedirect'||index==levelList.length-2" @click.prevent="handleLink(item)">{{ uniqueStair }}</a>
                    <a v-else @click.prevent="handleLink(item)">{{ uniqueSublevel }}</a>
                </span>
                <span v-else>
                    <span v-if="item.redirect==='noRedirect'||index==levelList.length-1" class="no-redirect">{{ uniqueStair }}</span>
                    <a v-else @click.prevent="handleLink(item)">{{ uniqueSublevel }}</a>
                </span>
                
            </el-breadcrumb-item>
        </transition-group>
    </el-breadcrumb>
</template>

<script>
import pathToRegexp from 'path-to-regexp'

export default {
    data() {
        return {
            levelList: null,
            uniqueStair: '',// 一级
            uniqueSublevel: '', // 二级
            uniqueThere: ''// 三级
        }
    },
    watch: {
        $route() {
            this.getBreadcrumb()
        }
    },
    created() {
        this.getBreadcrumb()
    },
    methods: {
        getBreadcrumb() {
            // console.log(454, this.$router.options.routes)
            // only show routes with meta.title
            let matched = this.$route.matched.filter(item => item.meta && item.meta.title)

            console.log(678, matched,  this.$route.meta)
            // const first = matched[0]

            // if (!this.isDashboard(first)) {
            //   matched = [{ path: '/dashboard', meta: { title: 'Dashboard' }}].concat(matched)
            // }

            this.uniqueStair = localStorage.getItem('uniqueStair')
            this.uniqueSublevel = localStorage.getItem('uniqueSublevel')
            this.uniqueThere = localStorage.getItem('uniqueThere')

            this.levelList = matched.filter(item => item.meta && item.meta.title && item.meta.breadcrumb !== false)
            console.log(3333343, this.levelList)
        },
        isDashboard(route) {
            const name = route && route.name
            if (!name) {
                return false
            }
            return name.trim().toLocaleLowerCase() === 'Dashboard'.toLocaleLowerCase()
        },
        pathCompile(path) {
            // To solve this problem https://github.com/PanJiaChen/vue-element-admin/issues/561
            const { params } = this.$route
            var toPath = pathToRegexp.compile(path)
            return toPath(params)
        },
        handleLink(item) {
            const { redirect, path } = item
            if (redirect) {
                this.$router.push(redirect)
                return
            }
            this.$router.push(this.pathCompile(path))
        }
    }
}
</script>

<style lang="scss" scoped>
.app-breadcrumb.el-breadcrumb {
    display: inline-block;
    font-size: 16px;
    line-height: 60px;
    .no-redirect {
        color: rgba(0,0,0,0.45);
        cursor: text;
    }
}
.breadcrumbtitle {
    // font-size: 25px;
    font-weight: 600;
    letter-spacing: 2px;
    .no-redirect{
        color: rgba(0,0,0,0.65) !important;
    }
    // ::v-deep .el-breadcrumb__separator {
    //     font-size: 14px;
    //     position: relative;
    //     top: -4px;
    // }
}
</style>
